1. LED display shows the battery input voltage, output voltage. Car power cable can provides power for device easily. If the out put power is higher than 200W, please using the clips to a battery. 2. Dual USB ports, quick recharging for mobilephones, computers, laptop, emergency equipment etc, can be as a emergency power.Built-in fuses, safer recharging design and cooling fan prevents the car power converter from over-heat, saving power and energy. 3. Over voltage, overload, over-current, short circuiting, under-voltage, overheating, short circuit protections. 4. Lightweight and compact, for vacations, camping and work trips. It can be plugged into almost 12Volt power output vehicle, providing recharging opportunities anywhere.